Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chiet » hoc thiet, hoc nhiet, hoc hien
va phuong » va thuong, cac phuong
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
than ban » thanh ban, than man, nhuan ban
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh tranh va phuong cong dan ((than ban) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh tranh va phuong cong dan ((than ban) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh tranh va phuong cong dan ((than ban) or (toan ban))*.